// System call numbers
#define SYS_fork    1
#define SYS_exit    2
#define SYS_wait    3
#define SYS_pipe    4
#define SYS_read    5
#define SYS_kill    6
#define SYS_exec    7
#define SYS_fstat   8
#define SYS_chdir   9
#define SYS_dup    10
#define SYS_getpid 11
#define SYS_sbrk   12
#define SYS_sleep  13
#define SYS_uptime 14
#define SYS_open   15
#define SYS_write  16
#define SYS_mknod  17
#define SYS_unlink 18
#define SYS_link   19
#define SYS_mkdir  20
#define SYS_close  21

#define SYS_chpri  23   // 添加专为设置进程优先级的系统调用
#define SYS_sh_var_read     24
#define SYS_sh_var_write    25
// 添加四个信号量操作的相关系统调用的编号
#define SYS_sem_create      26
#define SYS_sem_p           27
#define SYS_sem_v           28
#define SYS_sem_free        29
// 添加共享内存的两个系统调用
#define SYS_shmgetat        30
#define SYS_shmrefcount     31
// 添加三个消息队列相关的系统调用
#define SYS_mqget           32
#define SYS_msgsnd          33
#define SYS_msgrcv          34
// 添加连个内存管理相关的系统调用
#define SYS_myfree          35
#define SYS_myalloc         36
